水生动物消化系统缺乏植酸酶,所以对饲料原料中以六磷酸肌醇钙镁盐形式存在的磷(植酸磷)不能利用(NRC,1993)。另外,植酸还会与饲料中的铁、锌、镁、锰等形成复杂难溶的植酸盐复合物,从而导致这些营养素的生物利用率降低。这严重制约了植物蛋白在水生动物饲料中的添加量。生产中通常要添加含磷矿物质饲料,如各种形式的磷酸盐、骨粉等补充可利用磷的不足,而 Aquatic animal digestive systems lack phytase and therefore can not utilize phosphorus (phytate) present in the feedstuff as calcium magnesium inositol hexaphosphate (NRC, 1993). In addition, phytic acid also forms complex, poorly soluble phytate complexes with iron, zinc, magnesium, manganese and the like in feed, resulting in a reduction in the bioavailability of these nutrients. This severely restricts the addition of plant protein to aquatic feed. The production of phosphate minerals are usually added feed, such as various forms of phosphate, bone meal and other available phosphorus deficiency, and